Web application whspr! creates a private feedback form that you can share on services like Twitter without revealing your real email address.

Simply enter your real email address, a description of what the form is for, and the number of days you want the form to be active. Once completed, you'll be given a URL to the form to share with others. This application could be useful for job postings, blog contests or giveaways—pretty much anything where you'd like email responses but don't want to give out an email address.